1205655606497 has 2 divisors, whose sum is σ = 1205655606498. Its totient is φ = 1205655606496.

The previous prime is 1205655606487. The next prime is 1205655606577. The reversal of 1205655606497 is 7946065565021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198851996241 + 6803610256 = 1094921^2 + 82484^2 .

It is an emirp because it is prime and its reverse (7946065565021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205655606497 - 2²⁴ = 1205638829281 is a prime.

It is a super-2 number, since 2×1205655606497² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1205655606487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602827803248 + 602827803249.

It is an arithmetic number, because the mean of its divisors is an integer number (602827803249).

Almost surely, 2^{1205655606497} is an apocalyptic number.

It is an amenable number.

1205655606497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205655606497 is an equidigital number, since it uses as much as digits as its factorization.

1205655606497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 1205655606497 in words is "one trillion, two hundred five billion, six hundred fifty-five million, six hundred six thousand, four hundred ninety-seven".